A complete next-to-leading order QCD description of resonant $Z'$ production and decay into $t\bar t$ final states

Fabrizio Caola; Kirill Melnikov; Markus Schulze

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A complete next-to-leading order QCD description of resonant $Z'$ production and decay into $t\bar t$ final states

Fabrizio Caola, Kirill Melnikov, Markus Schulze

High Energy Physics - Phenomenology · Submitted 27 Nov 2012

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We describe some examples of how QCD radiative corrections may influence both the exclusion limits and studies of properties of the new resonance, once it is discovered.

how it is stated · hedged possibility 1.00 read the record →

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arXiv ID1211.6387 (version 2)

Pith ID4XTQD6CT, Pith's permanent record of this paper and its review

CitationFabrizio Caola, Kirill Melnikov, Markus Schulze. "A complete next-to-leading order QCD description of resonant $Z'$ production and decay into $t\bar t$ final states." arXiv:1211.6387 (2012). https://pith.science/paper/4XTQD6CT

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,678 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.56 · states limitation 0.15 · human participants 0.01 · controlled comparison 0.13 · randomized assignment 0.01 · states quantitative result 0.04 · compares with prior results 0.94 · mentions code or data availability 0.02.

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arXiv listing abstract v2. Results and the main claim are underlined; show every role.

We discuss QCD radiative corrections to the production of a heavy neutral resonance $Z'$ at the LHC assuming that it decays into a $ t\bar t$ final state. Compared to previous studies, our computation includes top quark decays as well as interference between the $Z'$ signal process and the QCD $t \bar t$ background. The interference contribution appears for the first time at next-to-leading order (NLO) QCD and requires new one-loop amplitudes that are not present when signal and background are treated separately. We describe some examples of how QCD radiative corrections may influence both the exclusion limits and studies of properties of the new resonance, once it is discovered.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We discuss QCD radiative corrections to the production of a heavy neutral resonance $Z'$ at the LHC assuming that it decays into a $ t\bar t$ final state.	contribution 0.96	0.74	0.10	asserted 0.83
s1	Compared to previous studies, our computation includes top quark decays as well as interference between the $Z'$ signal process and the QCD $t \bar t$ background.	contribution 0.96	0.92	0.13	asserted 1.00
s2	The interference contribution appears for the first time at next-to-leading order (NLO) QCD and requires new one-loop amplitudes that are not present when signal and background are treated separately.	contribution 0.56	0.69	0.18	asserted 1.00
s3	We describe some examples of how QCD radiative corrections may influence both the exclusion limits and studies of properties of the new resonance, once it is discovered.	interpretation 0.89	0.70	0.23	hedged possibility 1.00

What kind of paper the classifier reports this is: theoretical result 0.93 · evidence from simulation or computation 0.91.

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The paper

Original abstract

We discuss QCD radiative corrections to the production of a heavy neutral resonance $Z'$ at the LHC assuming that it decays into a $ t\bar t$ final state. Compared to previous studies, our computation includes top quark decays as well as interference between the $Z'$ signal process and the QCD $t \bar t$ background. The interference contribution appears for the first time at next-to-leading order (NLO) QCD and requires new one-loop amplitudes that are not present when signal and background are treated separately. We describe some examples of how QCD radiative corrections may influence both the exclusion limits and studies of properties of the new resonance, once it is discovered.

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References

Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

A search for $t\bar{t}$ resonances using lepton-plus-jets events in proton-proton collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector
hep-ex 2015-05 conditional novelty 5.0 of 10

No top-pair resonance appears in 20.3 fb^-1 of ATLAS 8 TeV data, excluding a narrow leptophobic Z' below 1.8 TeV and a 15.3%-width Kaluza-Klein gluon below 2.2 TeV at 95% confidence.
Theory for Baryon Number and Dark Matter at the LHC
hep-ph 2014-09 conditional novelty 5.0 of 10

The authors derive an upper bound of about 35 TeV on the baryon-number symmetry breaking scale from the dark matter relic density, and show that the model's Z' and heavy Higgs decays into dark matter and top quarks gi...
Snowmass 2013 Top quark working group report
hep-ph 2013-11 accept novelty 2.0 of 10

The report compiles community projections showing that a future lepton collider can measure the top mass to about 100 MeV and top couplings an order of magnitude better than the high-luminosity LHC.

How the literature uses it

2 arXiv papers cite this in 3 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 1 sentence without a confident label

Uses its data or values 1 paper

We use a $K$-factor of $K= 1.1$ to account for next-to-leading order QCD effects in the $Z_B$ production and decay into $t̅t$ [ref] .

Theory for Baryon Number and Dark Matter at the LHC · Leptophobic Gauge Boson Decays · 0.81

Compares with it 1 paper

Notice that this is smaller than the value $K=1.3$ typically adopted by ATLAS [ref] , because a detailed calculation shows that additional negative contributions result in a reduction of the $K$-factor [ref] .

Theory for Baryon Number and Dark Matter at the LHC · Leptophobic Gauge Boson Decays · 0.81

What it cites · 31 sentences without a confident label

Uses the method or tool of 2 papers

We use the implementation described in Ref. [ref] .

NLO QCD corrections to top quark pair production and decay at hadron colliders · Setup · 1.00
We consider the kinematic distribution of the azimuthal angle $ϕ_+$, which is constructed in the following way [ref] .

Discriminating Top-Antitop Resonances using Azimuthal Decay Correlations · Numerical results · 0.98

Compares with 3 papers

This value is somewhat lower than $K ≈1.3$, which was reported in Ref. [ref] , and we attribute this difference to our use of MSTW2008 parton distribution functions, kinematic cuts on top quark decay products and inclusion of radiative corrections to top quark decays.

Next-to-leading order QCD corrections to a heavy resonance production and decay into top quark pair at the LHC · Numerical results · 1.00
We find that the NLO QCD corrections increase leading order cross sections by a modest amount that is somewhat smaller than what has been adopted in recent studies by the ATLAS and CMS collaborations [ref] .

A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV · Conclusion · 0.98
We find that the NLO QCD corrections increase leading order cross sections by a modest amount that is somewhat smaller than what has been adopted in recent studies by the ATLAS and CMS collaborations [ref] .

Search for Z' resonances decaying to ttbar in dilepton+jets final states in pp collisions at sqrt(s) = 7 TeV · Conclusion · 0.98

Cites as background 5 papers

For recent discussions in the context of the LHC see e.g. Refs. [ref] .

An Anomalous Extra Z Prime from Intersecting Branes with Drell-Yan and Direct Photons at the LHC · Introduction · 0.96
For recent discussions in the context of the LHC see e.g. Refs. [ref] .

Cross Sections for Leptophobic Topcolor Z' decaying to top-antitop · Introduction · 0.96
For recent discussions in the context of the LHC see e.g. Refs. [ref] .

Non-exotic $Z'$ signals in $\ell^+\ell^-$, $b\bar b$ and $t\bar t$ final states at the LHC · Introduction · 0.96

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